Chain wrench



(No Model.)

1J. H. VIN'ION. CHAIN WRENCH.

- No. 522,136. Patented Jun@v Z6, 1894.V

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JOHN H. VINTON, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE TRIMONT MANUFACTURING COMPANY, OF PORTLAND, MAINE.

CHAIN WRENCH.

SPECIFICATION forming part of Letters Patent No. 522,136, dated Jiune 26, 1 894. l Application led December 11, 1893. Serial No.493,313. (No model.)

.To @ZZ whom it' may concern.-

Be it known that I, JOHN H. VINTON, of Boston, county of Suffolk, State of Massachusetts, have invented an Improvement in Chain Wrenches, of which the following description, in connection with the accompan ying drawings, is a specification, like letters and figures on the drawings representing like parts.

The invention has for its object the production of a durable, strong, simple and eflicient chain wrench of great power, and one by which a pipe may be handled without the free end of the chain becoming accidentally loosened from the head of the wrench.

Figure l is a view of one side ofthe head of the wrench with the chain detached. Fig. 2 is a perspective detailshowing uppermost the opposite face of the head of the wrench and the chain. Fig. 3 is aplan view of that side of the head of the wrench which is up in Fig. 2, the jaws being partially broken 0E, the dotted lines representing the chain in position; and Fig. 4 shows in longitudinal section the head of the wrench, with a chain embracing a piece of pipe.

.The handle A of the wrench may be of any suitable size as to diameter and length, and of any suitable material. The head of the wrench is composed preferably of a forging B to which is adj ustably secured by set screws o, suitable rigid steel jaws B', preferably in the shape of segments with teeth to engage the pipe P. The head of the wrench has at one side of it a suitable pin, as b, in ears b', said pin serving to connect one link, as c, of the chain C, to the head. The opposite side of the head is provided with lips d, d, concaved at their rear sides, as at d', and brought nearly together at their outer ends, as in Fig. 3, the spaces between the lips d being substantially of a thickness of the link of a chain. The concavities d of the lips are of such shape as to receive the end of one of the links of the chain, and project rearwardly thereover or overhang`as represented in dotted lines by the link c2, Fig. 3, and bylink c2 full lines Fig. 4. The head is also slotted longitudinally, as at cl3, from a point back of said lips toward the handle of the wrench, and also forward of said lips, so that the end of the link c3 joining the link c2, as well as the link c4, may rest with their edges in said slot, the said slot being extended preferably forward to the outer end of the head, as to the point 4, see Figs. l and 4.

As described and represented it will be understood that the chain, when laid about a pipe, as represented in Fig. 4, and drawn up taut, will have one of its links, as for instance, the link c3 laid in between the lips d and the end of the link c2 nearest the toothed end of the head will enter the concavities d of the lips and lit said concavities in such manner that the chain cannot be disengaged frombetween the lips unless the chain is moved in the direction of the arrow near it in Fig. 4 sufficient-ly to draw the round end of the link c2 out from said concavities and beyond the rearward overhanging portions of the lips when the link c3 may be lifted from between the inner walls of the lips d.' In j practice the lips CZ are so shaped as to receive and fit the links and hold on to the chain and keep the latter seated without any liabilityr of the free end of the chain ,becoming accidentally detached from the head while the wrench is being used.

The chain shown is an ordinary round link chain, a form of chain inexpensive to construct, and yet of great strength. Having described my invention, what I claim, and desire to secure byLetters Patent,

1. In a chain wrench,ahead B having rigid toothed jaws B', and provided with lips b concaved at their sides farthest from the said jaws and shaped to present over-hanging portions, said lips at their concaved sides presenting a llat surface upon which may rest the two sides of a chain link while the over-hanging portions of the lips embrace the end of said link, the slot between the lips d being extended down below the surface upon which rests the latlink and being made to -intersect a groove, da, which shall receive the lower half of a vertically held link to prevent twisting thereof substantially as described, the over-hanging lips and groove positively retaining the chain in place.

2. In a chain Wrench, a headBhaving rigid toothed jaws B and provided with lips con- IOO one of the links of said chain being adapted i to stand vertically between said lips, and also to enter said slot cl3 while the next link of the 1o chain enters byits round end the oonoavities of the lips and is retained therein by their overhanging portions, substantially as described.

In testimony whereof I have signed my naine to this specification in the presence of two subscribing witnesses.

JOHN Il. VINTON.

Witnesses:

Gmo. W. GREGORY, M. J. SHERIDAN. 

